depends on how much you're looking to overclock, because there are some really good air coolers out there. you could also just try using a better thermal compound like TX-3 or the OCZ stuff. have you been monitoring temps or do you just think that the heat is what's causing the computer to crash? again, it sort of depends on the hardware and how much you're looking to push it.

what frequency,voltage,multi, 'FSB' etc is it failing at?
Try raising the multi only, if your not already, to isolate the weak link. Unless you lost the binning lottery (which happens occasionally) the Phenom II x 6's should get to 4Ghz at or under 1.45v
and what PSU model/specs are you using?

The retail heatsink absolutely sucks. I have that CPU and the stock sink is VERY load. I purchased an aftermarket dual fan cooler and it is quite quiet. The cpu is a heat generator and my computer room is one room I do not have to heat in the winter! lol

The retail heatsink absolutely sucks. I have that CPU and the stock sink is VERY load. I purchased an aftermarket dual fan cooler and it is quite quiet. The cpu is a heat generator and my computer room is one room I do not have to heat in the winter! lol

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Tedster, did you get the two copper heat-pipe version of the retail HSF with your x6?

Once your ambients start to rise though, look out. Through summer here we get ambients in the high 30C's - low 40C's and that's the reason I went with water.
Probably in the range of 25C and below, the stock hs is fine though.
The 1090T's definitely run cooler than the Phenom II X 4's though.